Stock Average Down Calculator
New average cost after buying more shares.
Enter your values
Enter the shares owned you are working with.
Enter the average price paid in $.
Enter the new shares you are working with.
Enter the new price in $.
Results update instantly as you type — no submit needed. Your values are remembered on this device, and the shareable link reopens the calculator with exactly these numbers.
- New average cost
- $37.88
- Total shares
- 160
- Total invested
- $6,060.00
- Gain needed to break even
- 22.18%
Working
- 1(100x$42.00 + 60x$31.00) / 160 = $37.88
Quick answer
Your new average cost is total money invested divided by total shares held after the additional purchase.
avg = (shares1 x price1 + shares2 x price2) / (shares1 + shares2)
At a glance
| What it does | New average cost after buying more shares. |
|---|---|
| Category | Finance |
| Inputs needed | Shares owned, Average price paid, New shares, New price |
| Main output | New average cost |
| Formula | avg = (shares1 x price1 + shares2 x price2) / (shares1 + shares2) |
| Cost | Free — no sign-up, no download |
How to use the Stock Average Down Calculator
- 1Enter your existing share count and average price.
- 2Enter the new purchase quantity and price.
- 3Check how far the stock must rise from here to break even.
Inputs explained
- Shares owned
- Enter the shares owned you are working with.
- Average price paid($)
- Enter the average price paid in $.
- New shares
- Enter the new shares you are working with.
- New price($)
- Enter the new price in $.
Worked example
Using the values the calculator loads with:
Inputs
- Shares owned100
- Average price paid42 $
- New shares60
- New price31 $
Results
- New average cost$37.88
- Total shares160
- Total invested$6,060.00
- Gain needed to break even22.18%
- (100x$42.00 + 60x$31.00) / 160 = $37.88
Frequently asked questions
Is averaging down smart?
Only when your original thesis still holds; otherwise it concentrates a losing position.
Does it lower my loss?
It lowers the break-even price, not the dollar loss already incurred.
What do I need to enter into the Stock Average Down Calculator?
Just 4 values: shares owned, average price paid, new shares, new price. Every field starts with a realistic example, so you can change one number at a time and watch the result update instantly.
How does the Stock Average Down Calculator work out the answer?
Your new average cost is total money invested divided by total shares held after the additional purchase. It applies the formula avg = (shares1 x price1 + shares2 x price2) / (shares1 + shares2) and shows the working so you can check each step by hand.
Is the Stock Average Down Calculator free, and do I need an account?
It is completely free with no sign-up, no download and no usage limit. Everything is calculated in your browser, so the numbers you type never leave your device.
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.